CN109810421B

CN109810421B - Semi-permeable display HIPS resin and preparation method thereof

Info

Publication number: CN109810421B
Application number: CN201811649529.0A
Authority: CN
Inventors: 于云安; 周霆; 辛敏琦
Original assignee: Shanghai Kumho Sunny Plastics Co Ltd
Current assignee: Shanghai Kumho Sunny Plastics Co Ltd
Priority date: 2018-12-30
Filing date: 2018-12-30
Publication date: 2021-07-23
Anticipated expiration: 2038-12-30
Also published as: CN109810421A

Abstract

The invention discloses a semi-permeable display HIPS resin and a preparation method thereof, wherein the semi-permeable display HIPS resin comprises the following components in parts by weight: 0-50 parts of high impact polystyrene resin (HIPS), 30-80 parts of polystyrene (GPPS), 2-20 parts of styrene-butadiene-styrene copolymer (SBS), 1-10 parts of Polyisobutylene (PIB), 0.5-3 parts of mineral powder, 0.1-1 part of light stabilizer, 0.1-1 part of antioxidant and 0.2-2 parts of lubricant. Through the introduction of SBS and PIB, the invention realizes the semi-transparent display of white parts on the basis of ensuring the impact property of materials, the displayed figures are free of burrs, the glossiness and whiteness of the parts are high, the surface effect is good, the invention can replace the base materials such as PMMA/ABS, PMMA and the like with higher cost, can be applied to display panels of household appliances such as refrigerators, washing machines, air conditioners and the like, and has wide market application value.

Description

Semi-permeable display HIPS resin and preparation method thereof

Technical Field

The invention relates to the field of high polymer materials, in particular to a semi-transparent display HIPS resin and a preparation method thereof.

Background

With the technological progress, the demand of consumers on household appliances is larger and larger, and the requirement on display effect is higher and higher, but the conventional High Impact Polystyrene (HIPS) is difficult to achieve a good burr-free transparent display effect due to the large rubber particle size, so that the panel of the household appliance is usually made of transparent ABS or PMMA/ABS material to ensure the impact and transparent display effects, but the general household appliance has a large housing and the transparent ABS and PMMA are expensive, which is a problem that is difficult to avoid for manufacturers.

Disclosure of Invention

The invention aims to improve the surface whiteness and the transparent display effect of HIPS on the basis of keeping the impact property of the HIPS, and further provides a semi-transparent display HIPS resin and a preparation method thereof.

The purpose of the invention is realized by the following technical scheme:

the invention provides a semi-transparent display HIPS resin composition, which comprises the following components in parts by weight:

high impact polystyrene resin (HIPS): 0-50 parts;

polystyrene (GPPS): 30-80 parts of a solvent;

styrene-butadiene-styrene copolymer (SBS): 2-20 parts of a solvent;

polyisobutylene (PIB): 1-10 parts;

mineral powder: 0.5-3 parts;

light stabilizer: 0.1-1 part;

antioxidant: 0.1-1 part;

lubricant: 0.2-2 parts.

Preferably, the rubber content of the HIPS is 4% -10%, and the average particle size of the rubber is 0.5-10 μm; when the rubber content is less than 4%, the impact of HIPS is too low, and when the rubber content is more than 10%, the see-through effect of the article is remarkably reduced.

Preferably, the GPPS transmittance is greater than 88% and the melt index is less than 40g/10min (200 ℃,5 kg). The light transmittance of the GPPS is lower than 88%, and the effect of improving the light transmittance of the material is poor by introducing the GPPS; the melt index of GPPS is more than 40g/10min, and the introduction of high-flow GPPS can cause the impact of the material to be obviously reduced.

Preferably, the SBS has the weight average molecular weight of 50000-300000 and the melt index of 2-40 g/10min under the condition of 200 ℃ and 5 kg.

Preferably, the weight average molecular weight of the polyisobutylene is 20000-400000, and the polyisobutylene is viscous.

Preferably, the titanium pigment is one or more of titanium dioxide, barium sulfate and talcum powder. In the invention, titanium dioxide is taken as an example, and rutile type titanium dioxide is preferred. The average particle size of the mineral powder is preferably 0.05-0.7 μm, the surface effect of the material is poor when the particle size of the mineral powder is larger than 0.7 μm, the dispersibility of the mineral powder is poor when the particle size of the mineral powder is smaller than 0.05 μm, the dispersion is uneven easily, and the price is high.

Preferably, the light stabilizer is one or a mixture of more of benzophenone ultraviolet absorbers, benzotriazole ultraviolet absorbers or hindered amine radical scavengers.

Preferably, the antioxidant is one or a mixture of at least two of Pasteur phosphite antioxidant 168, hindered phenol antioxidant 1010, Irganox1076 and Irganox 245.

Preferably, the lubricant is one or a mixture of silicone oil, hard fatty amide, paraffin, ethylene bis stearamide or silicone lubricant.

The invention also provides a preparation method of the semi-transparent display HIPS resin, which comprises the following steps:

s1, weighing the components in parts by weight;

s2, mixing the components weighed in the step S1 in a high-speed mixer for 2-10 min to obtain a mixture;

and S3, feeding the mixture obtained in the step S2 from a main feed of a double-screw extruder, and carrying out melt extrusion, cooling, drying and grain cutting to obtain the semi-transparent display HIPS resin composition.

Preferably, in step S3, the twin-screw extruder is a co-rotating twin-screw extruder, the length-diameter ratio of the screws is 20 to 40, and the screw barrels are provided with a vacuum pumping device and a temperature control device.

Preferably, the temperature of a feeding section of the double-screw extruder is 160-180 ℃, the temperature of a plasticizing section of the double-screw extruder is 180-200 ℃, and the temperature of a homogenizing section of the double-screw extruder is 190-210 ℃; the rotation speed of the screw is 200-700 rpm.

Compared with the prior art, the invention has the following beneficial effects:

aiming at the defects of poor light transmission and burr display of the existing HIPS, the cost of the material is greatly reduced by compounding GPPS, SBS and polyisobutylene and whitening by using barium sulfate, so that the impact resistance and the light transmission of a product are balanced, the light transmission effect of the white HIPS is greatly improved, and no burr is generated.

Drawings

Other features, objects and advantages of the invention will become more apparent upon reading of the detailed description of non-limiting embodiments with reference to the following drawings:

FIG. 1 is a perspective view showing the effect of a sample of a semi-transparent HIPS resin having a thickness of 2.5 mm.

Detailed Description

The present invention will be described in detail with reference to specific examples. The following examples will assist those skilled in the art in further understanding the invention, but are not intended to limit the invention in any way. It should be noted that variations and modifications can be made by persons skilled in the art without departing from the spirit of the invention. All falling within the scope of the present invention.

The following examples and comparative examples used the starting materials:

HIPS is HIPS5050 of Dow chemical, the rubber content of the HIPS is 8.2%, and the average particle size of the rubber is 1.6 microns; the GPPS adopts PG-33 of Zhenjiangqimei, the transmittance is 92 percent, and the melt index is 11g/10 min; SBS is KTR-601 from Korea brocade lake, and has melt index of 12g/10min (200 deg.C, 5 kg); the polyisobutene adopts Pasteur Hsy550, and the weight-average molecular weight is 58000; the titanium dioxide is DuPont rutile type titanium dioxide, and the particle size is 0.26 mu m; the barium sulfate adopts 0.7 mu m Sachtleben Micro specification barium sulfate of Shanghai Gaihai cast industry Co Ltd; the auxiliary agent comprises antioxidant B900 (Ciba), light stabilizer Tinuvins UVP (Ciba) and lubricant barium stearate, and the weight ratio of the three auxiliary agents is 1:1: 2.

HIPS resins prepared in examples 1 to 8 and comparative examples 1 to 4 were dried at 70 ℃ for 5 hours, and then injection-molded into sample bars of standard physical properties and sample plates of 2.5mm (see FIG. 1) under the same injection molding conditions according to ASTM standards, and the physical properties and light transmittance of each resin composition were measured, and the specific test standards and conditions are shown in Table 1.

TABLE 1

Example 1

The embodiment provides a semi-transparent display HIPS resin and a preparation method thereof, and the preparation method comprises the following specific steps:

(1) weighing the components according to the weight ratio in the table 2;

(2) mixing the weighed components in a high-speed mixer for 2-10 min to obtain a mixture;

feeding the mixed mixture from a main feed of a double-screw extruder, and performing melt extrusion, cooling, drying and grain cutting to obtain a sample; the device comprises a double-screw extruder, a screw, a vacuum pump and a temperature control device, wherein the double-screw extruder is a co-rotating double-screw extruder, the length-diameter ratio of the screw is 20-40, and a cylinder of the screw is provided with the vacuum pump and the temperature control device; the temperature of a feeding section of the double-screw extruder is 160-180 ℃, the temperature of a plasticizing section of the double-screw extruder is 180-200 ℃, and the temperature of a homogenizing section of the double-screw extruder is 190-210 ℃; the rotation speed of the screw is 200-700 rpm.

Example 2

The embodiment provides a semi-transparent HIPS resin and a preparation method thereof, wherein the weight ratio of raw materials is shown in Table 2, and the preparation method is the same as that of embodiment 1.

Example 3

Example 4

Example 5

Example 6

Comparative example 1

The comparative example provides a semi-transparent HIPS resin and a preparation method thereof, the weight ratio of the raw materials is shown in Table 2, and the preparation method is the same as that of example 1.

Comparative example 2

Comparative example 3

Comparative example 4

TABLE 2

The results of physical properties, surface gloss and transmittance of the HIPS resins of examples 1 to 6 and comparative examples 1 to 4 are shown in Table 3 below.

TABLE 3

The test results of examples 1-6 and comparative examples 1-4 in Table 3 show that the physical properties, transmittance and whiteness of the HIPS composition are obviously improved and the surface gloss is also obviously improved by introducing SBS and PIB.

The invention has many applications, and the above description is only a preferred embodiment of the invention. It should be noted that the above examples are only for illustrating the present invention, and are not intended to limit the scope of the present invention. It will be apparent to those skilled in the art that various modifications can be made without departing from the principles of the invention and these modifications are to be considered within the scope of the invention.

Claims

1. A semi-permeable display HIPS resin composition is characterized by comprising the following components in parts by weight:

high impact polystyrene resin HIPS: 10-50 parts;

polystyrene GPPS: 30-80 parts of a solvent;

styrene-butadiene-styrene copolymer SBS: 2-20 parts of a solvent;

polyisobutylene PIB: 1-10 parts;

mineral powder: 0.5-3 parts;

light stabilizer: 0.1-1 part;

antioxidant: 0.1-1 part;

lubricant: 0.2-2 parts of a solvent;

the high impact polystyrene resin contains 4-10% of rubber, and the average particle size of the rubber is 0.5-10 mu m;

the transmittance of the polystyrene is 88-96%, and the melt index under the conditions of 200 ℃ and 5kg is 5-40 g/10 min.

2. The semi-permeable HIPS resin composition according to claim 1, wherein the weight average molecular weight of the styrene-butadiene-styrene copolymer is 50000 to 300000, and the melt index under the condition of 200 ℃ and 5kg is 2 to 45g/10 min.

3. The semi-permeable HIPS resin composition according to claim 1, wherein the weight average molecular weight of the polyisobutylene is 20000 to 400000, and the polyisobutylene is in a viscous state.

4. The semi-permeable HIPS resin composition according to claim 1, wherein the mineral powder is one or more of titanium dioxide, barium sulfate and talc, and the average particle size is 0.05-0.7 μm.

5. The translucent HIPS resin composition of claim 1, wherein the light stabilizer is one or more of benzophenone ultraviolet absorbers, benzotriazole ultraviolet absorbers and hindered amine radical scavengers.

6. The translucent display HIPS resin composition of claim 1, wherein the antioxidant is one or a mixture of at least two of Pasteur phosphite antioxidant 168, hindered phenol antioxidant 1010, Irganox1076, and Irganox 245.

7. The semi-permeable HIPS resin composition according to claim 1, wherein the lubricant is one or a mixture of stearic acid amide, paraffin wax and silicone lubricant.

8. A method of producing the semi-permeable displaying HIPS resin composition according to claim 1, comprising the steps of:

s1, weighing the components in parts by weight;

9. The method for preparing a semi-transparent HIPS resin composition according to claim 8, wherein in step S3, the twin-screw extruder is a co-rotating twin-screw extruder, the length-diameter ratio of the screws is 20 to 40, and the barrels of the screws are provided with a vacuum pumping device and a temperature control device; the temperature of a feeding section of the double-screw extruder is 160-180 ℃, the temperature of a plasticizing section of the double-screw extruder is 180-200 ℃, the temperature of a homogenizing section of the double-screw extruder is 190-210 ℃, and the rotating speed of a screw is 200-700 rpm.